github.com/aquanetwork/aquachain@v1.7.8/aqua/accounts/abi/event.go (about) 1 // Copyright 2016 The aquachain Authors 2 // This file is part of the aquachain library. 3 // 4 // The aquachain library is free software: you can redistribute it and/or modify 5 // it under the terms of the GNU Lesser General Public License as published by 6 // the Free Software Foundation, either version 3 of the License, or 7 // (at your option) any later version. 8 // 9 // The aquachain library is distributed in the hope that it will be useful, 10 // but WITHOUT ANY WARRANTY; without even the implied warranty of 11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 // GNU Lesser General Public License for more details. 13 // 14 // You should have received a copy of the GNU Lesser General Public License 15 // along with the aquachain library. If not, see <http://www.gnu.org/licenses/>. 16 17 package abi 18 19 import ( 20 "fmt" 21 "strings" 22 23 "gitlab.com/aquachain/aquachain/common" 24 "gitlab.com/aquachain/aquachain/crypto" 25 ) 26 27 // Event is an event potentially triggered by the EVM's LOG mechanism. The Event 28 // holds type information (inputs) about the yielded output. Anonymous events 29 // don't get the signature canonical representation as the first LOG topic. 30 type Event struct { 31 Name string 32 Anonymous bool 33 Inputs Arguments 34 } 35 36 func (event Event) String() string { 37 inputs := make([]string, len(event.Inputs)) 38 for i, input := range event.Inputs { 39 inputs[i] = fmt.Sprintf("%v %v", input.Name, input.Type) 40 if input.Indexed { 41 inputs[i] = fmt.Sprintf("%v indexed %v", input.Name, input.Type) 42 } 43 } 44 return fmt.Sprintf("event %v(%v)", event.Name, strings.Join(inputs, ", ")) 45 } 46 47 // Id returns the canonical representation of the event's signature used by the 48 // abi definition to identify event names and types. 49 func (e Event) Id() common.Hash { 50 types := make([]string, len(e.Inputs)) 51 i := 0 52 for _, input := range e.Inputs { 53 types[i] = input.Type.String() 54 i++ 55 } 56 return common.BytesToHash(crypto.Keccak256([]byte(fmt.Sprintf("%v(%v)", e.Name, strings.Join(types, ","))))) 57 }